The answer depends on the shape and what information you have about it.
But basically, it is the sum of the lengths of all line segments that from the boundaries of the shape.
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The formula for the perimeter of a square is P equals 4 times a. 'P' represents the perimeter, and 'a' represents a side of the square.
the formula is 1side multiply by 3
Circumference or perimeter = 2*pi*radius or pi*diameter
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Assuming the shape is a regular dodecagon, the formula for calculating the perimeter for a dodecagon of side length n is equal to 12n.